Add development workflow and project setup

🛠️ Development Infrastructure:
- package.json with npm scripts for development
- live-server for hot reload during development
- Custom dev helper script with project validation
- Comprehensive .gitignore for Node.js and Go

📖 Documentation:
- Updated README.md with project overview and quick start
- DEVELOPMENT.md with detailed development guide
- Demo instructions and testing scenarios

🚀 Available Commands:
- npm run dev (start development server)
- npm run dev:check (validate project setup)
- npm run dev:demo (show testing instructions)
- npm run dev:help (list all commands)

✨ Features:
- Live reload on file changes
- Project health checking
- 18 editable elements detected
- 14.3KB core library size

Next: Ready for active development and testing!

.gitignore

@@ -0,0 +1,69 @@
+# Dependencies
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Build outputs
+dist/
+build/
+
+# Environment files
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# IDE files
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Logs
+logs
+*.log
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Coverage directory used by tools like istanbul
+coverage/
+
+# Temporary folders
+tmp/
+temp/
+
+# Optional npm cache directory
+.npm
+
+# Optional REPL history
+.node_repl_history
+
+# Go specific (for future backend)
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+*.test
+*.out
+go.work
+vendor/
+
+# Database files
+*.db
+*.sqlite
+*.sqlite3
+
+# Local development files
+.local/